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Composite numbers whose largest prime factor are less than their second-largest prime factor's square, counting by multiplicity so that the factors of 18 are 2, 3, 3
cnoocy: green a-e ligature (Default)
I have a post up today at my company's tech blog about using OpenSCAD to create 3d objects, specifically a plane-based d20:
cnoocy: green a-e ligature (Default)
So, there's a podcast, Coverville, that plays cover songs. I've been listening to it for a number of years, and it's a pretty popular podcast. In a couple of weeks, they're doing a 24-hour coverthon, a half-fundraiser/half-benefit. They're offering hourly sponsorships, which give the sponsor the chance to have their business mentioned multiple times in the hour, and have a logo up on the stream.

My crazy idea is to have one of these hours be sponsored by the letter R and the number 7, as if it were an episode of Sesame Street. We'll be essentially anonymous to the show's listeners.

It'll cost some money (the total for a sponsorship is $150), but I can put up a lot of it, and I have at least one co-conspirator.

Anyway, let me know, by comment, email, or private message, if you want to be part of this. Or if you have any questions.
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You might think that the topic of baby names would only be of interest to you if you are actively in the process of deciding what to name a baby. You would be wrong. As the Baby Name Wizard, Laura Wattenberg uses the statistical study of baby names as a lens to look at a fascinating array of topics, from a three-part series on the racial context of baby-naming urban legends to a discussion of romance author pen names to an analysis of the New England Patriots' influence on the popularity of the name Brady.

If you find statistical analysis at all interesting (and I would give odds you've spent some time reading, her blog is highly recommended.
cnoocy: green a-e ligature (Default)
What do you consider the key facts and applications that should appear in a short introduction to differential calculus?
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1. Found an equation that will cause my cell phone's calculator to freeze and reboot the entire phone (Samsung Stripe, (2^1024)^1.5)
2. Taught Jeffrey Rowland the word "zarf"
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192 * 4 + 1 = 172 * (4 + 1)
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Last year I posted some music I had generated by factoring integers. I've been thinking about it off and on since then and last night I got something that I liked.
1.1K MIDI 336K MP3 (Both are 14 seconds long)

The details )

I'd love to hear what you think!

ETA: I should mention that most of my changes amount to "do what [ profile] mrmorse told me to."
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I am fascinated by the HD-DVD encoding key that is making the rounds of all the tech news. (Digg is a good source at the moment.) It's a number that's small enough to be tractable, but not obvious. I'm posting this so I can get back to work instead of spending the day looking for compact/elegant mathematical ways to express the number. (Something that's easy to memorize, say.) Feel free to try it yourselves!
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So last night I posted some music. If you want to try to figure out what it is, read that post, not this one.

The actual source )
cnoocy: green a-e ligature (Default)
26/15 is a very good (off by less than 1/779) approximation for the square root of 3.
I have found this fact useful when doodling on graph paper during meetings, particularly when drawing a clock in a 10x10 square.
It has been said that I am very odd.
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If the popular version of Moore's law (computing speed increases by a factor of 2 every 18 months) were to apply continuously,(which it doesn't) at what point does a process become not worth hitting start on.

That is, if I have a program that takes 80 years to run, I shouldn't start it now. I can get it done in 23 years by waiting 3 years, at which point the program will only take 20 years. So at what point (expressed as current time to completion) should I hit start?

I have an answer, but I'd like someone to check my math. So if you're interested in trying it yourself, do so before clicking on the cut-tag.

What I have )
cnoocy: green a-e ligature (Default)
script here )

Run on a unix machine, pick one-character arguments if desired, pipe through uniq.
ETA: 08:37:04 on Saturday morning, Eastern Time.
cnoocy: green a-e ligature (Default)
220,996,011-1 is prime.
cnoocy: green a-e ligature (Default)
from a Unix prompt:
date +%s | factor

what this does:
gives you the prime factorization of the current Unix timestamp.

I think I need to build this as a desktop clock.

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